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Capitalization - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jan. 31, 2019	Mar. 31, 2019	Mar. 31, 2018
Warrants
Stock issued (in shares)	7,563,725
Share price (in dollars per share)	$ 30.20
Net proceeds from public offerings	$ 224,400	$ 224,441	$ 0
Over-Allotment Option
Warrants
Stock issued (in shares)	843,725

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